Rule



E. G. RIOS.

mus.

APPLICATION FILED MAY 24 1919.

Patented May 4, 1920.

I N V EN T05. G. P: as

A TTORNE Y ERNESTO G. RIOS, OF CHICAGO, ILLINOIS.

RULE.

7 '0 all whom it may concern:

Be it known that I, ERNESTO Gr. Bros, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Rules, of which the following is a specification.

This invention relates to rules and more particularly to a rule adapted for guiding a pencil or pen whereby lines may be drawn at equally spaced intervals.

One of the objects of the invention is to provide a rule of this character which may be employed as a straight edge for map drawing.

The invention further aims to provide an improved rule having means whereby the rule may be moved successively for very short distances so that lines very close together may be drawn as required in map making and the like.

The above and additional objects are accomplished by such means as are illustrated in the preferred embodiment and in the accompanying drawings, wherein like char acters denote like or corresponding parts throughout the several views, in which Figure 1 is an edge elevation of the rule constructed in accordance with my invention,

Fig. 2 is a plan view Fig. 8 is a section on Fig. 1.

Fig. 1 is an end elevation.

Referring to the drawings, wherein is illustrated the preferred form of my invention, in which like numerals of reference indicate like or corresponding parts throughout the several Views, the rule consists of the bar 1 which may be of any preferred length and which has its forward edge beveled as indicated at 2, the beveled surface being provided with suitable graduations 3. At a point approximately intermediate the ends of the rule, is a recess 1 formed by cutting out a portion of the rule as shown to advantage in Figs. 2 and 3. Attached to the rule at opposite ends of the recess are the brackets 5 each of which includes an upstanding portion 6 disposed considerably above the upper surface of the bar 1. A shaft 7 extends transversely across the space between the upright portion 6 and the ends of the shaft are journaled in the bracket so that it may be readily rotated. A knurled roller 8 is attached to of the same,

the line 3 3 of Specification of Letters Patent.

Patented May- 4, 1920.

Application filed May 24, 1919. Serial No. 299,395.

of a ratchet 11 pivotally mounted as indicated at 12 and urged into operative position by an expansion spring 13. The teeth of the ratchet wheel are relatively close together as shown to advantage in Fig. 4 so that only a slight movement of the knurled roller 8 is sufficient to cause the ratchet to pull from one tooth to another.

The shaft 7 is also provided with a pinion 14 in mesh with a gear 15 on a counter shaft 16 which has its ends journaled in the ratchet, and this gear meshes with a smaller gear 18 on a supporting shaft 1.9. The supporting shaft extends the full length of the rule and has its ends journaled in brackets 20 attached to the ends of the bar 1 and the ends of the shafts are slightly extended to receive supporting wheels 21 which support the rear edge of the roller as shown in Figs. 3 and 4:. Downwardly extended portions 22 are provided on the brackets 5 and these portions also receive the shaft 19 so that bending or distorting of the shaft will be prevented.

In use, the ruler will be placed upon the paper to be ruled as shown in Figs. 3 and 4 so that the forward edge of the ruler bears upon the paper while the rear edge is supported by the wheels 21. A line may then be drawn by using the forward edge of the rule as a straight edge. By holding the rule firmly with one hand and grasping the knurled roller 8 with the other, the shaft 7 may be turned by turning the roller 8 un' til the ratchet wheel moves the shaft for turning the wheels 21 the desired distance.

The ratchet wheel may be constructed so that the rule will move nearly one-sixtyfourth of an inch as it is sometimes necessary to draw lines in map making as close together as one sixty-fourth of an inch, it will be obvious that the advantage of accurately moving the rule will greatly add to the accuracy of the work and speed with which it is accomplished.

The foregoing description and accompanying drawings have reference to what might be considered to be the preferred or approved form of my invention. I desire it to be understood that I may make such changes in the construction, combination tance when the said means is manually actuated, for sliding the said bar a predetermined distance.

2. A ruler comprising a bar having a supporting shaft provided with wheels atits ends to support the rear edge of the bar, brackets carried by the bar, a shaft, means for manually actuating the shaft,

and gearing mechanism mounted on the said shaft to cause rotation of the supporting shaft when the said means is actuated.

3. A ruler comprising a bar having a sup porting shaft provided with wheels to sup port the rear edge of the bar, brackets carried by the bar, a shaft having a ratchet wheel attached thereto, a spring pressed ratchet engageable with the teeth of the ratchet wheel, a counter shaft, gearing mechanism mounted on the said shafts and intermeshing to cause rotation of the said supporting shaft when the said ratchet is actuated. v V

In testimony whereof I afliX my signature in presence of witnesses. t

ERNESTO G. RIOS.

WVitnesses OLIN E. VENGHAUS, HARRY CHALooPoULos, RUDOLPH J. KLEwANoK. 

